<div *ngIf="hero">
    <h2>{{ hero.name | uppercase }} Details</h2>
    <div><span>id:</span>{{ hero.id }}</div>
    <label>name:
      <input [(ngModel)]="hero.name" placeholder="name">
    </label>
</div>
<button (click)="save()" >save</button>
<button (click)="goBack()">go back</button>
